Comparative ultrastructure of the gastrotrich pharynx and the evolution of myoepithelial foreguts in aschelminthes

Abstract

Structural and ultrastructural data are presented for the myoepithelial pharynges of 20 species of Gastrotricha representing the marine Macrodasyida and marine and freshwater Chaetonotida. A comparative analysis reveals that pharynges with several plesiomorphic characters occur in Chordodasys among the Macrodasyida and Neodasys among the Chaetonotida. The… (More)
DOI: 10.1007/BF00312295

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